Kurtosis run doesnt some of the syntax from main.star file given in their guide to set up a private ethereum blockchain

[varun-g91]

What's your CLI version?

1.8.1

Description & steps to reproduce

This is the main.star file given in their guide to set up a private ethereum blockchain:

main.star

import yaml

geth = import_module("github.com/kurtosis-tech/geth-package/lib/geth.star")
lighthouse = import_module("github.com/kurtosis-tech/lighthouse-package/lib/lighthouse.star")
with open("./network_params.yaml") as stream:
    network_params = yaml.safe_load(stream)

def run(plan):
    # Generate genesis, note EL and the CL needs the same timestamp to ensure that timestamp based forking works
    final_genesis_timestamp = geth.generate_genesis_timestamp()
    el_genesis_data = geth.generate_el_genesis_data(plan, final_genesis_timestamp, network_params)

    # NEW LINES TO ADD:
    # Run the nodes
    el_context = geth.run(plan, network_params, el_genesis_data)
    lighthouse.run(plan, network_params, el_genesis_data, final_genesis_timestamp, el_context)

    return

When I run kurtosis run main.star I get the following error:

main.star
INFO[2025-06-02T08:51:16+05:30] Creating a new enclave for Starlark to run inside...
INFO[2025-06-02T08:51:17+05:30] Enclave 'tropical-cenote' created successfully
There was an error interpreting Starlark code
Evaluation error: module has no .load_yaml field or method
at [7:26]: run

Error encountered running Starlark code.

INFO[2025-06-02T08:51:19+05:30] ========================================================
INFO[2025-06-02T08:51:19+05:30] || Created enclave: tropical-cenote ||
INFO[2025-06-02T08:51:19+05:30] ========================================================
Name: tropical-cenote
UUID: 19af60c6f390
Status: RUNNING
Creation Time: Mon, 02 Jun 2025 08:51:16 IST
Flags:

========================================= Files Artifacts =========================================
UUID Name

========================================== User Services ==========================================
UUID Name Ports Status

Desired behavior

It should run the script successfully and create a private etherum blockchain

What is the severity of this bug?

Critical; I am blocked and Kurtosis is unusable for me because of this bug.

What area of the product does this pertain to?

CLI: the Command Line Interface

[tedim52]

Hey, thanks for making the issue! The guide you mentioned is quite outdated and seems to be using a much earlier version of Kurtosis Starlark: https://docs.kurtosis.com/how-to-compose-your-own-testnet/